Diigo is a website for social annotation. It combines social bookmarking, clippings, in situ annotation, tagging, full-text search, easy sharing and interactions for knowledge users. Knowledge sharing combined with these tools can turn websites into writable, participatory and interactive media.
Diigo
http://www.diigo.com/
Possible Uses for Web 2.0 Instruction
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Description Resource
Go2Web2.0